William h



'NITED TATES FFrcE.

WILLIAM H. BARNHART, OF INDIANAPOLIS, INDIANA.

HUB=BORING MACHINE.

SPECIFICATION forming part of Letters Patent No. 383,848, dated June 5,1888.

Application filed January 25, 1883. Serial No. 261,884. (No mode whichworks therein. The lower end of this screw-rod is formed into a verticalrod, T, which has openings to'receive bits b, these bits having astraight shank and turning up into a cutting-edge, as shown in Fig. 5.At the upper end of this rod two of these bits are set one above theother, and, as will be seen by reference to Fig. 3, the cutting portionof the upper one is connected at the base of the To ctZZwhom it mayconcern.-

Be it known that I, WILLIAM H. BARNHART, of Indianapolis, county ofMarion, and State of Indiana, have invented certain new and usefulImprovements in Hub-Boring Machines; and I do hereby declare that thefollowing is a full, clear, and exact description thereof, referencebeing had to the accompanying drawings, in which like letters refer tolike parts.

My invention relates to the construction of devices forboring holes inhubs to receive iron boxings, and will be understood from the followingdescription:

In the drawings, Figure 1 represents a side view of my device, one armof the frame being cut off, so as not to obscure the view. Fig. 2 is atop view of the same. Fig. 3 is a vertical section of the upper part ofthe rod carrying the bits, showing the double bit at the top and the keysecuring the same in place. Fig. 4 is a similar section of one of thelower bits and a part of the rod. Fig. 5 is a top view of one of thebits. Fig. 6 is a top view of the claspnut in which the screw-rodconnected with the hand-wheel works. Fig. 7 is a side view of the same,showing the jaws of the nut locked in place.

In detailf is a frame-work composed of uprights j", connected by armsf", which are adjustable as to length by means of bars ab, having slots.s-Z sl", in the latter of which pins 19 move as guides, and the formerhas a bolt, bt, having a nut on the top for locking the parts togetherat the right point. These side arms of the frame are for the purpose ofcentering the hub. The other arms of the frame have slots sl at theirextreme ends and bolts pass ing through the same for fastening thebraces 11 thereto, as shown in Fig. 1. These braces carry and supportnear their upper ends a circular plate, pl, to which the jawsj of theclaspnut n are hinged at h, as shown in Fig. 6. This plate also has aslot, 82, and when the jaws of the nut are brought together alockstaple, 7c, is set astride these jaws, the points of this stapleentering the slot 81 on each side, locking them together, as shown inFig. 7. \Vhcn the nut is in this position, the closed jaws held togetherby the key, as shown in Fig. 7, the threaded central portion or nutproper, a, is ready to receive the screwrod so,

cutting part is fixed near the top of the shank, and their cutting-edgesare opposite each other, and are thus brought nearer together(vertically) than if they were connected tothe shank in the same way,instead of one being connected at the bottom of the shank and the otherat or near the top. The object of this is to bring the cutting-edges ofthese upper knives close together, so that one will directly follow theother in cutting out the enlargement at the top of the bore, which isintended to receive the shoulder formed on the inner and larger end ofthe boxing. Below these are singlebits, and all are secured in the rod1" by keys is in the manner shown in Figs. 3 and 4. They are settapering in the rod, so that as the bits are turned into the hub theholeis enlarged as the auger descends, thus making atapering hole in thehub largest at the upper end and corresponding in diameter with'theboxing generally used. In practice they are set a little more taperingthan shown in Fig. l of the drawings. farther from the center of the rodthan those below, the distance being gradually diminished from top tobottom.

The hub (represented at H) is centered be tween the side arms of theframe f, as shown in Fig. 2, and is supported and held directly betweenadjustable braces ab, bolted to the armsf, as shown in Fig. 1.

Beneath the table portion of the frame is a cross-bar, and upon this isbolted a metal guideplate, 9, through which the lower end of the rodpasses, its object being to secure a vertical movement of the rod as theauger enters the hub, the upper end of the screw-rod being held in placein the clasp-nut n and the lower end by theguide-plateg,thusinsuring themovement in a vertical plane throughout all parts of the tool.

The upper bits are set out a littleshank, while in the lower one of thepair the 72 is a hand-wheel secured to the top of the screw-rod so, forturning the same in the nut n, and as the operator turns down the screwby this hand-wheel the rod 1' is carried down with the bits I), boringan opening in the center of the hub.

-When the operation is finished and the hub is bored far enough, bytaking out the key 7c and opening the jawsj of the claspnut thescrew-rod and the rod r, with its bits, may be withdrawn from the hub bya pull of the hand without the necessity of turning the screw-rod back,so as to operate the withdrawal of the rod 1" by means of the threads inthe nut n, thus saving a great deal of time in withdrawing the tool fromthe hub.

The wheel w is supported upon the crossarms of the frame work and heldin place by thumbscrews ts.

I am aware that clasp-uuts are not new, and that wheel-boring machineshaving tapering bits have been heretofore used, and do not broadly claimthe same as my invention.

WVhat I claim as my invention, and desire to secure by Letters Patent,is the following:

1. Thehub-boring machinehereindescribed, comprising the frame work ff,having adjustable arms f for centering the hub, the braces b, bolted tothe ends of the arms f supporting the plate pl, the clasp-nut at, havingjaws j, hinged to the plate at h, the key k, for holding the jaws of thenut together, the screw so, working in such nut, carrying the rod r,havingadjustable bits 5, secured by keys therein, all combinedsubstantially as shown and described.

2. In a hub-boring machine, an auger composed of a rod mortised toreceive bits held in place by keys and set so as to bore a tapering holein the hub, the upper pair of bits set one upon the other, the cutter ofthe upper one connected near the base of its shank and the cutter of thelower one connected to its shank at or near the top, their cntting=edgesformed on opposite sides, substantially as and for the purposedescribed.

3. In a hub-boring machine, aframe-work for supporting the wheel, itsside arms adjustbore a tapering hole in the hub, all combinedsubstantially as shown and described.

4. In a hub-boring machine, an auger-rod,

-r, carrying detachably-secured bits thereon,

the upper pair set one upon the other, the cutter of the upper oneconnected to its shank at or near its base, the cutter of the lower oneconnected to its shank at or near its top, the cutters of the pairformed on opposite sides for forming an enlargement in the bore toreceive the shoulder of the boxing, such auger connected with operatingscrew mechanism above and its lower end moving in a guideplate securedbeneath the table to the framework, all combincd substantially as shownand described. V

5. In ahub-boring machine, a frame-work for supporting the wheel havingadjustable side arms for centering the hub, aboring-auger composed ofarod carrying adjustable boringbits, such auger operated by a screw-r0dworking in a clasp-nut, its lower end having bearings in aoguide-platesecured beneath to the framework, the upper pair of bits upon the rodset one upon the other, the cutter of the upper bit secured at or nearthe base of its shank, the cutter of the lower of the pair se cured ator near the top of its shank, the cutting-edges of the pair formed onopposite sides for enlarging the bore to receive the shoulder of theboxing, substantially as shown and described.

In witness whereof I have hereunto set my hand this 28d day of January,1888.

WILLIAM H. BARNHART.

Vita esses:

O. P. JAooBs, E. B. GRIFFITH.

